2001851868537 has 12 divisors (see below), whose sum is σ = 2984840062464. Its totient is φ = 1291517334360.

The previous prime is 2001851868529. The next prime is 2001851868551. The reversal of 2001851868537 is 7358681581002.

2001851868537 is a `hidden beast` number, since 2 + 0 + 0 + 18 + 518 + 6 + 85 + 37 = 666.

It is not a de Polignac number, because 2001851868537 - 2³ = 2001851868529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001851868517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3587547873 + ... + 3587548430.

It is an arithmetic number, because the mean of its divisors is an integer number (248736671872).

Almost surely, 2^{2001851868537} is an apocalyptic number.

It is an amenable number.

2001851868537 is a deficient number, since it is larger than the sum of its proper divisors (982988193927).

2001851868537 is a wasteful number, since it uses less digits than its factorization.

2001851868537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175096340 (or 7175096337 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 2001851868537 in words is "two trillion, one billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, five hundred thirty-seven".